Yamaha PSR-S770, Руководство по обслуживанию

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PSR-S770/PSR-S970
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6. Crystal Display
(Time required: About 7 minutes)
6-1. Remove the lower case assembly. (See procedure 2.)
6-2. Remove the center panel assembly. (See procedure 5.)
6-3. Remove the two (2) screws marked [300A]. The LCD
fixture L can then be removed. (Fig. 7)
6-4. Remove the two (2) screws marked [300B]. The LCD
fixture R can then be removed. (Fig. 7)
* When installing the LCD fixture L and R, tighten
screws while pushing it in the arrow direction.
* When installing the LCD fixture L and R, tighten
screws in the order of
z
to
v
as shown in Fig. 7.
6-5. Remove the crystal display.
6-6. Remove the FFC S LF wiring assembly. (Fig. 7)
7. PNS Circuit Board
(Time required: About 9 minutes)
7-1. Remove the lower case assembly. (See procedure 2.)
7-2. Remove the center panel assembly. (See procedure 5.)
7-3. Remove the eighteen (18) screws marked [300C]. The
PNS circuit board can then be removed. (Fig. 8)
* When installing the PNS circuit board, fit the PNS
circuit board to the positioning pins at 2 locations
shown in Fig. 8 first, tighten the screws
z
and
x
in
that order and then tighten the other screws.
8. PNM Circuit Board
(Time required: About 10 minutes)
8-1. Remove the lower case assembly. (See procedure 2.)
8-2. Remove the center panel assembly. (See procedure 5.)
8-3. Remove the LCD fixture L. (See procedure 6-3.)
8-4. Remove the LCD fixture R. (See procedure 6-4.)
8-5. Remove the twenty-six (26) screws marked [300D].
The PNM circuit board can then be removed. (Fig. 8)
* When installing the PNM circuit board, apply the PNM
circuit board to the positioning marks at 3 locations
shown in Fig. 8 first, tighten the screws
z
and
x
in
that order and then tighten the other screws.
9. HP Circuit Board
(Time required: About 4 minutes)
9-1. Remove the lower case assembly. (See procedure 2.)
9-2. Remove the four (4) screws marked [430B]. The HP
circuit board can then be removed. (Fig. 4)
10. Keyboard Assembly
(Time required: About 4 minutes)
10-1. Remove the lower case assembly. (See procedure 2.)
10-2. Remove the screw marked [420B]. The keyboard
assembly can then be removed. (Fig. 4)
11. Wheel Assembly, PB Circuit Board
(Time required: About 4 minutes)
11-1. Remove the lower case assembly. (See procedure 2.)
11-2. Remove the two (2) screws marked [500A]. The PB
circuit board can then be removed with the wheel
assembly. (Fig. 9)
* The wheel assembly is not part of the PB circuit
board. When replacing the PB circuit board, remove
the wheel assembly from the PB circuit board, and
install it on the new circuit board.
PNM
PNS
[300C] x 18
z
x
[300D] x 26
z
x
Positioning mark (applied to circuit board) Positioning pin (fit to circuit board)
Positioning pin (fit to circuit board)
Fig. 8